Wideband DS-CDMA for next-generation mobile communications systems
Wideband DS-CDMA for next-generation mobile communications systems
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DOI：
10.1109/35.714618
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发表时间：
1998-09
期刊：
影响因子：
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通讯作者：
F. Adachi;M. Sawahashi;H. Suda
中科院分区：
文献类型：
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作者：
F. Adachi;M. Sawahashi;H. Suda
对针对第三代移动通信系统的基于直接序列码分多址的宽带无线接入进行了综述。宽带码分多址（W - CDMA）旨在灵活地提供当前蜂窝系统无法提供的宽带服务，其各种数据速率高达2 Mb/s。W - CDMA的重要概念是引入小区间异步操作以及与各个数据信道相关联的导频信道。小区间异步操作有利于从室外到室内的连续系统部署。W - CDMA的其他技术特征包括小区间异步操作下的快速小区搜索、快速发射功率控制、相干扩频码跟踪、相干瑞克接收机、正交多扩频因子前向链路以及具有盲速率检测的可变速率传输。与数据信道相关联的导频信道的引入使得W - CDMA能够支持干扰消除和自适应天线阵列技术，这可以显著提高链路容量和覆盖范围。本文介绍了通过计算机仿真评估的无线链路性能，还给出了现场实验无线链路性能结果。
Wideband wireless access based on direct sequence code division multiple access aimed at third-generation mobile communications systems is reviewed. W-CDMA is designed to flexibly offer wideband services which cannot be provided by present cellular systems, with various data rates as high as 2 Mb/s. The important concept of W-CDMA is the introduction of intercell asynchronous operation and the pilot channel associated with individual data channels. Intercell asynchronous operation facilitates continuous system deployment from outdoors to indoors. Other technical features of W-CDMA include fast cell search under intercell asynchronous operation, fast transmit power control, coherent spreading code tracking, a coherent RAKE receiver, orthogonal multispreading factor forward link, and variable-rate transmission with blind rate detection. The introduction of the data-channel-associated pilot channel allows W-CDMA to support interference cancellation and adaptive antenna array techniques that can significantly increase the link capacity and coverage. This article presents the radio link performance evaluated by computer simulation. Field experiment radio link performance results are also presented.